Which of the following is a disease caused by protozoa?

Kala azar

The correct answer is Option (4) – Kala azar

Kala azar is a disease caused by protozoa.

• Kala azar, also known as visceral leishmaniasis, is caused by the protozoan parasite of the genus Leishmania.
• The disease is transmitted to humans through the bite of infected sandflies.
• Kala azar affects the internal organs, such as the liver, spleen, and bone marrow, leading to symptoms like fever, weight loss, and enlargement of the spleen and liver.
• It is important to note that AIDS is caused by the human immunodeficiency virus (HIV), Smallpox is caused by the variola virus, and Rabies is caused by the rabies virus.